1) Denon and Marantz are sister companies, their receivers’ performances are close enough that they can be treated as identical, main difference really is just the looks/UI. A Denon X4500 is the equivalent to the Marantz SR6013, and if you don’t need built-in phono, the X4400 is practically the same, and is just $900 (compared to $1500 for the SR6013).
2) HSU and Rythmik make better subs for the money than SVS in my opinion, although SVS is still good. I would suggest a single HSU VTF-2 MK5 to start (though buying two at once has a slight discount). If you want sealed, then the Rythmik L12 (also slight discount for buying two at once).
3) No need to buy matching surrounds, you won’t notice a difference, especially once you run Audyssey (the room correction that comes with Denon/Marantz, I would suggest the $20 mobile app to adjust the target curve if you wish to do so).
4) I would suggest for your front speakers: the Chane A1.4/A2.4, the HTD Level Three bookshelves+center, the NHT C1+C LCR, the NHT C3+ C LCR, the Ascend Acoustics CBM-170 + CMT-340, or the HSU HB-1 MK2 + HC-1 MK2.
5) I would suggest for your rear speakers: Fluance XLBP, Fluance Signature Bookshlef, or Polk OWM5.
2) HSU and Rythmik make better subs for the money than SVS in my opinion, although SVS is still good. I would suggest a single HSU VTF-2 MK5 to start (though buying two at once has a slight discount). If you want sealed, then the Rythmik L12 (also slight discount for buying two at once).
3) No need to buy matching surrounds, you won’t notice a difference, especially once you run Audyssey (the room correction that comes with Denon/Marantz, I would suggest the $20 mobile app to adjust the target curve if you wish to do so).
4) I would suggest for your front speakers: the Chane A1.4/A2.4, the HTD Level Three bookshelves+center, the NHT C1+C LCR, the NHT C3+ C LCR, the Ascend Acoustics CBM-170 + CMT-340, or the HSU HB-1 MK2 + HC-1 MK2.
5) I would suggest for your rear speakers: Fluance XLBP, Fluance Signature Bookshlef, or Polk OWM5.